中国有色冶金

The hydrolysis process for Fe removal exists such problems as large fluctuation of Fe2+ concentration in resulting solution, high Zn loss rate, high unit consumption of hydrogen peroxide and calcium carbonate, etc. Under this background, the continuous and intermittent combined goethite Fe removal process is proposed, while considering the actual production conditions and site conditions. In this process, oxygen is used to replace hydrogen peroxide, the dosing method of hydrogen peroxide is optimized, dross is used as neutralizer to replace calcium carbonate, by these methods the Fe2+ in the resulting solution is reduced below 25mg/L, Zn concentration in the resulting solution improved from 110g/L~120g/L to 130g/L~140g/L, Zn loss reduced from 6%~8% to 2%~3%, the unit consumption of hydrogen peroxide reduced by more than 70%, and no calcium carbonate is used.